US9049704B2ActiveUtilityA1
Method and apparatus for transmitting control information in wireless communication system
Est. expiryApr 18, 2032(~5.7 yrs left)· nominal 20-yr term from priority
H04W 72/20H04L 1/1861H04L 5/14H04W 72/0406H04L 27/26H04L 5/001H04L 5/0062H04L 5/0055H04L 5/0048H04L 5/1469H04L 5/0091H04L 1/18
79
PatentIndex Score
4
Cited by
11
References
10
Claims
Abstract
The present invention relates to a wireless communication system. In particular, the present invention relates to a method and apparatus for transmitting control information by means of a terminal in a CA-based wireless communication system, including the steps of: forming first and second cells that include different subframe configurations, wherein the second cell includes TDD UL-DL configuration #0; receiving a UL grant by means of the first cell; and transmitting data corresponding to the UL grant by means of the second cell.
Claims
exact text as granted — not AI-modifiedThe invention claimed is:
1. A method for performing a hybrid automatic repeat request (HARQ) procedure by a user equipment (UE) in a carrier aggregation (CA)-based wireless communication system, the method comprising:
configuring a first cell and a second cell having different subframe configurations, the second cell having time division duplex uplink-downlink (TDD UL-DL) configuration #0;
receiving a UL grant through the first cell; and
transmitting data corresponding to the UL grant through the second cell,
wherein a physical hybrid ARQ indicator channel (PHICH) resource for the data is determined by the following equations in the first cell,
n PHICH group =( I PRB — RA +n DMRS )mod N PHICH group +I PHICH N PHICH group
n PHICH seq =(└ I PRB — RA /N PHICH group ┘+n DMRS )mod 2 N SF PHICH
wherein n PHICH group represents a PHICH group index, n PHICH seq represents an orthogonal sequence index, I PRB — RA denotes a value relates to the index of a resource block used to transmit the data, n DMRS is obtained from a value of a demodulation reference signal (DMRS)-related field in scheduling information, N PHICH group indicates the number of PHICH groups, N SF PHICH indicates an orthogonal sequence length, and I PHICH is 0 or 1,
wherein retransmission for the data is performed on the basis of at least one of the PHICH and the UL grant when PHICH resource of I PHICH =0 is corresponding to the data,
wherein retransmission for the data is performed on the basis of only the UL grant when PHICH resource of I PHICH =1 is corresponding to the data.
2. The method according to claim 1 , wherein the subframe configuration of the first cell is configured according to one of TDD UL-DL configurations #1 to #6 or configured according to frequency division duplex (FDD), and subframe configurations according to TDD UL-DL configurations #1 to #6 are shown in the following table,
UL-DL
Subframe number
configuration
0
1
2
3
4
5
6
7
8
9
0
D
S
U
U
U
D
S
U
U
U
1
D
S
U
U
D
D
S
U
U
D
2
D
S
U
D
D
D
S
U
D
D
3
D
S
U
U
U
D
D
D
D
D
4
D
S
U
U
D
D
D
D
D
D
5
D
S
U
D
D
D
D
D
D
D
6
D
S
U
U
U
D
S
U
U
D
wherein D indicates a DL subframe (SF), U indicates a UL SF and S indicates a special SF.
3. The method according to claim 1 , wherein the UL grant includes UL scheduling information for at least one of a first UL SF and a second UL SF, the first UL SF preceding the second UL SF,
wherein retransmission for data of the first UL SF is performed on the basis of at least one of the PHICH and the UL grant, and retransmission for data of the second UL SF is performed on the basis of only the UL grant.
4. The method according to claim 1 , wherein, when the PHICH resource of I PHICH =1 is corresponding to the data, acknowledgement (ACK) information is signaled to a HARQ process of a medium access control (MAC) layer in a corresponding transmission time interval (TTI).
5. The method according to claim 1 , wherein the first cell is a scheduling cell and the second cell is a scheduled cell.
6. A UE configured to perform a HARQ procedure in a CA-based wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor,
wherein the processor is configured to configure a first cell and a second cell having different subframe configurations, the second cell having time division duplex uplink-downlink (TDD UL-DL) configuration #0, to receive a UL grant through the first cell and to transmit data corresponding to the UL grant through the second cell,
wherein a physical hybrid ARQ indicator channel (PHICH) resource for the data is determined by the following equations in the first cell,
n PHICH group =( I PRB — RA +n DMRS )mod N PHICH group +I PHICH N PHICH group
n PHICH seq =(└ I PRB — RA /N PHICH group ┘+n DMRS )mod 2 N SF PHICH
wherein n PHICH group represents a PHICH group index, n PHICH seq represents an orthogonal sequence index, I PRB — RA denotes a value relates to the index of a resource block used to transmit the data, n DMRS is obtained from a value of a DMRS-related field in scheduling information, N PHICH group indicates the number of PHICH groups, N SF PHICH indicates an orthogonal sequence length, and I PHICH is 0 or 1,
wherein retransmission for the data is performed on the basis of at least one of the PHICH and the UL grant when PHICH resource of I PHICH =0 is corresponding to the data,
wherein retransmission for the data is performed on the basis of only the UL grant when PHICH resource of I PHICH =1 is corresponding to the data.
7. The UE according to claim 6 , wherein the subframe configuration of the first cell is configured according to one of TDD UL-DL configurations #1 to #6 or configured according to FDD, and subframe configurations according to TDD UL-DL configurations #1 to #6 are shown in the following table,
UL-DL
Subframe number
configuration
0
1
2
3
4
5
6
7
8
9
0
D
S
U
U
U
D
S
U
U
U
1
D
S
U
U
D
D
S
U
U
D
2
D
S
U
D
D
D
S
U
D
D
3
D
S
U
U
U
D
D
D
D
D
4
D
S
U
U
D
D
D
D
D
D
5
D
S
U
D
D
D
D
D
D
D
6
D
S
U
U
U
D
S
U
U
D
wherein D indicates a DL SF, U indicates a UL SF and S indicates a special SF.
8. The UE according to claim 6 , wherein the UL grant includes UL scheduling information for at least one of a first UL SF and a second UL SF, the first UL SF preceding the second UL SF,
wherein retransmission for data of the first UL SF is performed on the basis of at least one of the PHICH and the UL grant and retransmission for data of the second UL SF is performed on the basis of only the UL grant.
9. The UE according to claim 6 , wherein, when the PHICH resource of I PHICH =1 is corresponding to the data, ACK information is signaled to a HARQ process of a MAC layer in a corresponding TTI.
10. The UE according to claim 6 , wherein the first cell is a scheduling cell and the second cell is a scheduled cell.Join the waitlist — get patent alerts
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